diff --git a/build.gradle.kts b/build.gradle.kts
index feb3af9..b9b731c 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -30,7 +30,7 @@ repositories {
 dependencies {
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
     implementation(kotlin("reflect"))
-    api("com.github.ProjectMapK:Shared:0.12")
+    api("com.github.ProjectMapK:Shared:0.13")
 
     // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter
     testImplementation(group = "org.junit.jupiter", name = "junit-jupiter", version = "5.6.2") {
diff --git a/src/main/kotlin/com/mapk/kmapper/ParameterUtils.kt b/src/main/kotlin/com/mapk/kmapper/ParameterUtils.kt
index 9dd4d97..e7048d7 100644
--- a/src/main/kotlin/com/mapk/kmapper/ParameterUtils.kt
+++ b/src/main/kotlin/com/mapk/kmapper/ParameterUtils.kt
@@ -4,11 +4,12 @@ import com.mapk.annotations.KConverter
 import com.mapk.conversion.KConvertBy
 import com.mapk.core.KFunctionWithInstance
 import com.mapk.core.ValueParameter
+import com.mapk.core.getAnnotatedFunctions
+import com.mapk.core.getAnnotatedFunctionsFromCompanionObject
+import com.mapk.core.getKClass
 import kotlin.reflect.KClass
 import kotlin.reflect.KFunction
-import kotlin.reflect.full.companionObjectInstance
 import kotlin.reflect.full.findAnnotation
-import kotlin.reflect.full.functions
 import kotlin.reflect.full.isSubclassOf
 import kotlin.reflect.full.primaryConstructor
 import kotlin.reflect.full.staticFunctions
@@ -18,11 +19,11 @@ internal fun <T : Any> KClass<T>.getConverters(): Set<Pair<KClass<*>, KFunction<
     convertersFromConstructors(this) + convertersFromStaticMethods(this) + convertersFromCompanionObject(this)
 
 private fun <T> Collection<KFunction<T>>.getConvertersFromFunctions(): Set<Pair<KClass<*>, KFunction<T>>> {
-    return filter { it.annotations.any { annotation -> annotation is KConverter } }
+    return this.getAnnotatedFunctions<KConverter, T>()
         .map { func ->
             func.isAccessible = true
 
-            (func.parameters.single().type.classifier as KClass<*>) to func
+            func.parameters.single().getKClass() to func
         }.toSet()
 }
 
@@ -39,17 +40,12 @@ private fun <T : Any> convertersFromStaticMethods(clazz: KClass<T>): Set<Pair<KC
 
 @Suppress("UNCHECKED_CAST")
 private fun <T : Any> convertersFromCompanionObject(clazz: KClass<T>): Set<Pair<KClass<*>, KFunction<T>>> {
-    return clazz.companionObjectInstance?.let { companionObject ->
-        companionObject::class.functions
-            .filter { it.annotations.any { annotation -> annotation is KConverter } }
-            .map { function ->
-                val func: KFunction<T> = KFunctionWithInstance(
-                    function,
-                    companionObject
-                ) as KFunction<T>
+    return clazz.getAnnotatedFunctionsFromCompanionObject<KConverter>()?.let { (instance, functions) ->
+        functions.map { function ->
+            val func: KFunction<T> = KFunctionWithInstance(function, instance) as KFunction<T>
 
-                (func.parameters.single().type.classifier as KClass<*>) to func
-            }.toSet()
+            func.parameters.single().getKClass() to func
+        }.toSet()
     } ?: emptySet()
 }